Squeezing of gravitational waves at the source is not an observable resource after projection onto a detector mode; squeezing the detector can in principle witness quantum gravity, but the tiny coupling makes the signal undetectable.
Sudarshan,Equivalence of semiclassical and quantum mechanical descriptions of statistical light beams,Phys
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The Challenge of Detecting Quantum Nature of Gravitational Waves
Squeezing of gravitational waves at the source is not an observable resource after projection onto a detector mode; squeezing the detector can in principle witness quantum gravity, but the tiny coupling makes the signal undetectable.